to  get in on the act
<abbr style="text-decoration: underline;" title="get / be" > get</abbr>
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Definition & Meaning of "get in on the act"in English

to get in on the act
01

to take advantage of or become involved in an activity that someone else has started in an attempt to achieve the same amount of success or profit 

to [get|be] in on the act definition and meaning
Idiom
Informal

What is the origin of the idiom "get in on the act" and when to use it?

The origin of the idiom "get in on the act" can be traced back to the world of entertainment, particularly in theater and show business. In the context of theatrical performances, an "act" refers to a distinct segment or portion of a play or show, often with its own storyline or performance. The idiom likely emerged from the idea that individuals wanted to be part of the excitement and attention associated with a successful performance or show. It is used to express a desire to become involved in an activity, situation, or opportunity that is already underway and generating interest or success.

Examples
When the app became popular, every competitor tried to get in on the act. 
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